:root {
  color-scheme: light;
  --paper: #f4f7f8;
  --surface: #ffffff;
  --ink: #15242c;
  --muted: #56666e;
  --line: #d3dde1;
  --milk: #2f86d0;
  --perm: #d9861a;
  --focus: #15242c;
  --radius-lg: 22px;
  --radius-sm: 10px;
  --font: "Lexend", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #0f171b;
    --surface: #152129;
    --ink: #e7eef1;
    --muted: #98a8af;
    --line: #26363e;
    --milk: #5aa8ea;
    --perm: #f0a23c;
    --focus: #e7eef1;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--font);
}
main, header.site, footer.site { width: min(100% - 2.5rem, 46rem); margin-inline: auto; }

/* header */
header.site { display: flex; flex-wrap: wrap; align-items: baseline; gap: .25rem 1rem; padding: 1.5rem 0 0; }
.wordmark { font-weight: 600; font-size: 1.125rem; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.byline { color: var(--muted); font-size: .8125rem; }

/* intro */
.intro { padding: 3.5rem 0 1.75rem; }
h1 { font-weight: 600; font-size: clamp(2rem, 6vw, 3.1rem); line-height: 1.08; letter-spacing: -.025em; margin: 0 0 1rem; max-width: 15ch; }
.lead { font-size: 1.125rem; color: var(--muted); max-width: 38rem; margin: 0; }

/* picker: the one bold element */
.picker {
  display: grid; grid-template-columns: auto 1fr; gap: 1.5rem; align-items: center;
  background: var(--surface); border: 2px dashed var(--line); border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  transition: border-color .15s, background-color .15s;
}
.picker.dragging { border-color: var(--milk); background: color-mix(in srgb, var(--milk) 7%, var(--surface)); }
.teeth-art { width: 9.5rem; height: auto; }
.teeth-art path { fill: none; stroke-width: 5; stroke-linejoin: round; }
.teeth-art .milk { stroke: var(--milk); fill: color-mix(in srgb, var(--milk) 14%, transparent); }
.teeth-art .perm { stroke: var(--perm); fill: color-mix(in srgb, var(--perm) 14%, transparent); }
.picker-title { font-weight: 600; font-size: 1.25rem; margin: 0; }
.picker-hint { color: var(--muted); font-size: .9375rem; margin: .25rem 0 1rem; }
@media (max-width: 34rem) {
  .picker { grid-template-columns: 1fr; text-align: left; }
  .teeth-art { width: 7rem; }
}

/* buttons */
.actions { display: flex; flex-wrap: wrap; gap: .625rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 2.875rem;
  padding: .5rem 1.15rem; border-radius: 999px; border: 1.5px solid var(--line);
  background: var(--surface); color: var(--ink); font: 500 1rem var(--font); cursor: pointer;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.primary:hover { opacity: .9; }
.btn:focus-visible, .btn:focus-within, a:focus-visible { outline: 3px solid var(--milk); outline-offset: 3px; }
.btn[disabled] { opacity: .5; cursor: progress; }
.camera-only { display: none; }
@media (pointer: coarse) { .camera-only { display: inline-flex; } }

/* status */
.status { min-height: 1.6em; margin: 1rem 0 .5rem; color: var(--muted); font-size: .9375rem; }
.status.error { color: #c2410c; }
@media (prefers-color-scheme: dark) { .status.error { color: #fb923c; } }
.progress { height: 6px; border-radius: 999px; background: var(--line); overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--milk); transition: width .2s; }

/* result */
.result { padding-top: 1.5rem; }
.result h2 { font-weight: 600; font-size: 1.75rem; line-height: 1.2; letter-spacing: -.015em; margin: 0; }
.meta { color: var(--muted); font-size: .875rem; margin: .25rem 0 1rem; }
.photo-frame { margin: 0 0 1rem; }
#resultCanvas { display: block; width: 100%; height: auto; border-radius: var(--radius-sm); background: #000; }
.legend { display: flex; flex-wrap: wrap; gap: .4rem 1.25rem; margin-top: .6rem; font-size: .875rem; color: var(--muted); }
.legend-note { flex-basis: 100%; }
.swatch { display: inline-block; width: .85rem; height: .85rem; border-radius: 4px; margin-right: .4rem; vertical-align: -1px; }
.swatch.milk { background: var(--milk); }
.swatch.perm { background: var(--perm); }
.result h3 { font-weight: 600; font-size: 1.125rem; margin: 2rem 0 .75rem; }

.tooth-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.tooth-list li {
  display: grid; grid-template-columns: 2.25rem 1fr auto; gap: .9rem; align-items: center;
  padding: .7rem 0; border-bottom: 1px solid var(--line);
}
.tag {
  display: grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: 9px;
  font-weight: 600; color: #fff;
}
.tag.milk { background: var(--milk); }
.tag.perm { background: var(--perm); color: #1d1405; }
.tooth-name { font-weight: 500; }
.tooth-call { color: var(--muted); font-size: .875rem; }
.sure { width: 7.5rem; text-align: right; font-size: .8125rem; color: var(--muted); }
.sure-bar { height: 5px; border-radius: 999px; background: var(--line); margin-top: .3rem; overflow: hidden; }
.sure-bar i { display: block; height: 100%; background: var(--ink); }
.unsure { display: inline-block; margin-left: .4rem; padding: 0 .45rem; border-radius: 999px; border: 1px solid var(--line); font-size: .75rem; color: var(--muted); }

/* notes + footer */
.notes { margin: 3.5rem 0 0; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.notes h2 { font-weight: 600; font-size: 1.125rem; margin: 0 0 .5rem; }
.notes ul { margin: 0; padding-left: 1.2rem; color: var(--muted); }
.notes li + li { margin-top: .3rem; }
.caution { margin: 1.25rem 0 0; padding: .9rem 1.1rem; border-radius: var(--radius-sm); background: var(--surface); border: 1px solid var(--line); font-size: .9375rem; }
footer.site { padding: 2.5rem 0 3rem; color: var(--muted); font-size: .8125rem; }
footer.site p { margin: 0 0 .5rem; max-width: 40rem; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}